Not really. It all comes down to a network protocol to sync changes. I collaborated with others just fine in desktop-first apps like CounterStrike or Diablo lon

Not really. It all comes down to a network protocol to sync changes. I collaborated with others just fine in desktop-first apps like CounterStrike or Diablo long before web became a viable platform. The reason MS Office struggles with this is that rebuilding an app that wasn't originally supposed to work in such mode is way harder than building from scratch, and they probably don't really need it that much to push themselves in such an adventure.